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The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of a bicycle frame. The tube through which the steerer of the fork passes is called the head tube. A typical headset consists of two cups that are pressed into the top and bottom of the headtube.
Portage strap: a strap (usually made of leather) attached to the inside of the bike frame, designed to make carrying the bike over one's shoulder easier; Pulley wheel: see Jockey wheel; Power meter: a device on a bicycle that measures the power output of the rider; Quick release: a skewer with a lever on one end that loosens when the lever is ...
Aerozine ceramic external bottom bracket bearing cups for BSC/ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom bracket shell. The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely.
Adapter kits are available to enable use of a 1″ fork in a frame designed for a 1â…›″ steerer tube or a 1â…›″ fork in a 1½″ frame. Manufacturers of high-end bikes, both road and mountain, have adopted tapered steerer tubes as the de facto standard, with a 1â…›″ OD at the top and a 1½″ OD at the bottom.
The 'diamond' frame's central, horizontal top bar forces the rider to swing a leg over the bicycle's seat. A Triumph step-through, ladies', or open frame Dursley Pedersen bicycle circa 1910 A penny-farthing photographed in the Škoda Auto Museum in the Czech Republic A Brompton folding bicycle Bicycle in Victorian Plymouth, England, with a predecessor of the Starley diamond-frame A cantilever ...
Less commonly 31.8 mm (1 + 1 ⁄ 4 in) was used on some mountain bikes and tandems and has now returned on some carbon fiber forks, and 38.1 mm (1 + 1 ⁄ 2 in) is found on high end Downhill bikes. A threadless stem should match the outside diameter of the steerer tube; a reducing shim may be employed to match a 28.6 mm ( 1 + 1 ⁄ 8 in) stem ...
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